Still, the minute you notice the red safety layer appear, you'll know it's time to change the toy. (geekwrapped.com)
It provides an extra safety layer to the bike as well. (policybazaar.com)
That way, you have a «layers of protection» system and if one safety layer breaks down, such as someone leaves the gate to the pool open, your child still can't get out to the pool. (verywellfamily.com)